Book/Dissertation / PhD Thesis

FZJ-2021-02520

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Scalable Control Electronics for a Spin Based Quantum Computer

Geck, L. (Corresponding author)FZJ*

2021
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-540-6

Please use a persistent id in citations: http://hdl.handle.net/2128/28404  urn:nbn:de:0001-2021080444

Abstract: In the last years, the topic of quantum computing has received increased attention and arising number of universities, research institutes and companies are exploring it. Onereason for that is the great potential to solve some of today’s practically intractablemathematical problems. The superiority of quantum computers is based on quantum mechanicaleffects in the smallest computation unit, the quantum bit (qubit). The operationand readout of these qubits is complex and very sensitive to noise and other disturbances.For a universal, programmable quantum computer qubit numbers in the order of millionsneed to be operated together which is a great scale up from today’s 53 qubits.For a qubit several dierent implementations exist and one promising candidate type arequbits made out of semiconductor materials. They typically store information in the spinof localized charge carriers. The manipulation of that spin and the corresponding computationis possible through electrical signals. However, due to the operation requirementsof the qubit the electronic-qubit interface is very complex and current control methodsare not feasible for large qubit numbers.The goal of this work is a systematic study of the scalability of integrated controlelectronics based on existing, industrial complementary metal-oxide-semiconductor(CMOS) technology. Included in this goal is also the identication of potential hindrancesto the scalability and necessary subsequent research and the interaction of the electronicswith other parts of the quantum computer. In this work, the so called gallium-arsenideS-T qubit is used as a reference and most of the technology parameter values take a65 nm CMOS process into account.In a first step, a control concept for the qubits was developed and its scalability judgedon the estimated area and power consumption of the integrated circuit. Next to the65nm technology parameter values, also extrapolated values for smaller nodes wereused. Results show that the main hindrance to scalability is the power consumption ofthe electronics and in order to scale up to millions of qubits technology advancementsare necessary, among others. In the more near term application technologies with lowdigital supply voltage are promising.The second step was to derive a behavioral model not only of the electronic controlconcept but the interface to the rest of the quantum computer and the qubit, as well.Simulations of the complete system show that the electronics concept works as designedand qubit control is possible. The interaction of the different units also highlights thatprocesses critical to the scalability are for example the measurement and the adaption ofpulse sequences to each individual qubit.

Note: Dissertation, RWTH Aachen University, 2020

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Contributing Institute(s):

1. Zentralinstitut für Elektronik (ZEA-2)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2021

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